Blocking off rear AC lines - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 06-09-2011, 10:36 AM
cplnorton cplnorton is offline
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2002 GMC Envoy SLT
Light Pewter Metallic 4.2L I6 4X4
Join Date: Jun 2011
Location: Van Wert, OH
Posts: 3
Blocking off rear AC lines

I just bought a 2002 envoy XL with the rear AC. I knew the AC didn't work when I bought it. Brought it home and the system has a leak. It's in the rear lines which I now know is a problem with these vehicles.

Anyways, I'm thinking of blocking these off, as I've seen the block off kits.

My question is, how well does the AC work with the back blocked off? Does the vehicle still cool down pretty well? Also I've seen block off kits for around $70. Does anyone know of any cheaper or what are the best ones to buy?

I doubt I ever use the third row seating very much, so I don't think it would be a huge issue.

Also I'm thinking my compressor might be toast as well. I jumped the low side switch with a paperclip, just to see if it would kick on, and it did nothing.

Is that a sign the compressor is bad as well?

Thanks in advance.
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  #2  
Old 06-09-2011, 01:20 PM
Big Jim 2003's Avatar
Big Jim 2003 Big Jim 2003 is offline
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2003 Chevy TrailBlazer LT EXT
Dark Gray Metallic 4.2L I6 4X4
Join Date: Nov 2009
Location: Thorold Ontario Canada
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Rear AC capped

I would suggest that you go to a qualified AC tech.,but not to a dealer as I learned the hard way.An AC shop can trouble shoot your system for about 100 dollars and save you alot of trouble changing out parts in the hope for a fix.You need to pull vacuum on the system,before you can refill and I dont know if you have this equipment.The reason I say not a dealer is because their labor cost are higher and they will only replace parts not patch or cap the rear lines if that is what you need.I paid dealer $115 for diagnostics and they said they would not patch or cap lines,only replace them($1200).
I recently had the rear lines capped,cost $320 tax included.The AC is working OK and I rarely used to rear AC before any ways.I will know better after this weekend as I am going on a trip up north. I hope this has been helpful and good luck. JIM
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Old 06-13-2011, 04:29 AM
mundalahoree mundalahoree is offline
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2006 Chevy TrailBlazer LT
Imperial Blue Metallic 4.2L I6 4X4
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i have almost the matching issue.rare blower is running but no air flow is comming thriugh openings, any suggestions
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Old 06-13-2011, 08:53 AM
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99Yuk 99Yuk is offline
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2006 GMC Envoy Denali XL
Monterey Maroon Metallic 5.3L V8 4X4
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My wife's AC also does not work, and diagnosed it to be the rear lines leaking. I'm ok with blocking the rear lines too.

So I'm gonna wait to see th eoutcome here before I do anything drastic to mine.
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Old 06-13-2011, 10:55 AM
sLAsh sLAsh is offline
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2005 GMC Envoy SLT XL
Liquid Silver Metallic 4.2L I6 4X4
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Anyone tried one of these kits yet?
http://cgi.ebay.com/ebaymotors/New-Rear-A-C-high-pressure-line-AC-Trailblazer-Envoy-/170631332806?pt=Motors_Car_Truck_Parts_Accessories &hash=item27ba6b83c6

It looks like an ideal solution to our problems
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Old 06-13-2011, 12:40 PM
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Big Jim 2003 Big Jim 2003 is offline
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2003 Chevy TrailBlazer LT EXT
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Quote:
Originally Posted by sLAsh View Post
That is definately an option if you want to save the rear air feature of this system.I did not see a need for it in the climate were I live,but if you live in Florida or Texas sure.The cost of this or capping works out about the same.I had mine capped recently and air is working fine now. BIG JIM
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